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# How to Calculate Transmission Reliability in ns3

To calculate transmission reliability in ns3, we have to evaluate the successful transmission of packets between nodes over time. Transmission reliability can be described as the ratio of successfully received packets to the total number of transmitted packets.

Here is the complete guide on calculating transmission reliability in a ns3.

Steps for calculation

1. Set up your ns3 :
• Make sure that ns3 is installed in the computer. If not, install it.
1. Create a new ns3 script :
• In the scratch directory of ns3, create a new script.
1. Include necessary libraries :
• In your script, include the necessary libraries.
1. Define network topology :
• For your network topology, create multiple nodes.
1. Implement transmission reliability Calculation Logic :
• Keep track of the number of packets sent and received.
1. Running the Simulation :
• Define the simulation time and run the simulation.

Example for calculating transmission reliability in ns3

Here is the example for the calculation of transmission reliability :

#include “ns3/core-module.h”

#include “ns3/network-module.h”

#include “ns3/internet-module.h”

#include “ns3/wifi-module.h”

#include “ns3/mobility-module.h”

#include “ns3/applications-module.h”

using namespace ns3;

NS_LOG_COMPONENT_DEFINE (“TransmissionReliability”);

uint32_t packetsSent = 0;

uint32_t packetsReceived = 0;

void PacketSentCallback(Ptr<const Packet> packet)

{

packetsSent++;

}

{

}

int main(int argc, char *argv[])

{

uint32_t nNodes = 2;  // Number of nodes

double distance = 50.0;  // Distance between nodes

double totalTime = 10.0;  // Total simulation time

CommandLine cmd;

cmd.AddValue(“nNodes”, “Number of nodes”, nNodes);

cmd.AddValue(“distance”, “Distance between nodes”, distance);

cmd.AddValue(“totalTime”, “Total simulation time”, totalTime);

cmd.Parse(argc, argv);

NodeContainer nodes;

nodes.Create(nNodes);

WifiHelper wifi = WifiHelper::Default();

YansWifiChannelHelper channel = YansWifiChannelHelper::Default();

YansWifiPhyHelper phy = YansWifiPhyHelper::Default();

phy.SetChannel(channel.Create());

WifiMacHelper mac;

Ssid ssid = Ssid(“ns-3-ssid”);

mac.SetType(“ns3::StaWifiMac”, “Ssid”, SsidValue(ssid), “ActiveProbing”, BooleanValue(false));

NetDeviceContainer devices = wifi.Install(phy, mac, nodes);

MobilityHelper mobility;

Ptr<ListPositionAllocator> positionAlloc = CreateObject<ListPositionAllocator>();

positionAlloc->Add(Vector(0.0, 0.0, 0.0));  // Position of the first node

positionAlloc->Add(Vector(distance, 0.0, 0.0));  // Position of the second node

mobility.SetPositionAllocator(positionAlloc);

mobility.SetMobilityModel(“ns3::ConstantPositionMobilityModel”);

mobility.Install(nodes);

InternetStackHelper stack;

stack.Install(nodes);

Ipv4InterfaceContainer interfaces = address.Assign(devices);

UdpEchoServerHelper echoServer(9);

ApplicationContainer serverApps = echoServer.Install(nodes.Get(1));

serverApps.Start(Seconds(1.0));

serverApps.Stop(Seconds(totalTime));

echoClient.SetAttribute(“MaxPackets”, UintegerValue(100));

echoClient.SetAttribute(“Interval”, TimeValue(Seconds(0.1)));

echoClient.SetAttribute(“PacketSize”, UintegerValue(1024));

ApplicationContainer clientApps = echoClient.Install(nodes.Get(0));

clientApps.Start(Seconds(2.0));

clientApps.Stop(Seconds(totalTime));

// Set up trace callbacks for packet sent and received

Config::ConnectWithoutContext(“/NodeList/*/ApplicationList/*/\$ns3::OnOffApplication/Tx”, MakeCallback(&PacketSentCallback));

Simulator::Stop(Seconds(totalTime));

Simulator::Run();

double reliability = (double)packetsReceived / (double)packetsSent * 100.0;

std::cout << “Packets Sent: ” << packetsSent << std::endl;

std::cout << “Packets Received: ” << packetsReceived << std::endl;

std::cout << “Transmission Reliability: ” << reliability << “%” << std::endl;

Simulator::Destroy();

return 0;

}

Explanation

1. Nodes and links :

Nodes are created and positioned them at a certain distance apart.

1. Wi-Fi setup :

Wi-Fi channel, physical layer, and MAC layer for the nodes are configured.

1. Mobility :

To keep the nodes stationary, ConstantPositionMobilityModel is used.

1. Applications :

On one node, a UDP echo server is installed. and On another node, a UDP echo server is installed to generate traffic.

1. Transmission reliability calculation logic :

To track the number of packets sent and received, PacketSentCallback and PacketReceivedCallback are implemented. Connected these callbacks to the appropriate trace sources.

1. Running the Simulation :

The simulation runs. Transmission reliability is calculated and printed, after the simulation.

Overall, we had a calculation on transmission reliability in ns3 by evaluating the successful transmission of packets between nodes over time. Also, we provide more related information on transmission reliability.

Upon analyzing your specified parameters, we provide you with performance analysis relevant to transmission reliability in NS3. Share with us the parameters you intend to compare with ns3simulation.com.